Advances in Physics Research

In this paper, the effects of Cr on the microstructure and basic mechanical properties of high Nb-TiAl alloy are studied respectively. The results show that the alloying high Nb - TiAl alloy have film layer microstructure, when adding 2%Cr (at.%), compared with not adding Cr alloy, its microstructure...

We discuss our recent theoretical and experimental work in cardiac systems. The first is about the rhythmic variation as the cardiac myocyte cell culture synchronized, and how it can be explained in terms of the frequency enhancement phenomenon in coupled excitable systems. Another work concerns the...

In this paper, the optimum thermo-acoustic stack position was investigated. Two types of parallel-plate stacks made of celluloid negative film and ABS materials were selected and investigation was carried out over three working frequencies. The ABS stack revealed that the farther of the stack position...

The tensile strength of a 2D woven C/SiC composite laminates notched with central hole was analyzed and calculated by finite element method. By considering the nonuniformity, material of open-hole specimen was divided into several parts with different density. Tensile properties of 2D woven C/SiC composites...

Methylene blue dyes in is widely used various industries in Indonesia, especially in the textile industry. Methylene blue in waters is toxic and difficult to degrade. One of the methods used is to overcome this problem is photocatalysis under visible light. CuO photocatalyst was prepared using an easy...

The graph used in this paper is a connected, bounded, and undirected graph G, is used which contains a set of vertex V(G) and a set of edge E(G). It is called the efficient dominating set of a graph if every point V in D or is adjacent to one vertex in D. For a set of solutions of G in an ordered set,...

This study aimed to use multigamma irradiation techniques (nuclear) to improve indigenous purple corn to produce better generation types that can withstand drought, harsh climates, pests and diseases, and high yields. Observation, sampling, irradiation, careful selection, purification, and interpretation...

The scattering of radiation rays from Co-60 affects the absorbed dose received by cancer cells and healthy organs. Herein, we tried to investigate the distribution of absorbed dose with skin-to-source distance (SSD) variations inside the cervix area due to irradiation of Co-60 from different locations....

A series of waterborne poly(urethaneacrylate)/ silica/titania (WPUA/SiO2/TiO2) composite materials were prepared by the sol-gel technique. The physical, mechanical and thermal properties of WPUA/SiO2/TiO2 dispersions and films were measured. The prepared composite materials were characterized by the...

Molecular docking approach has been successfully developed for prediction of enantioseparation of econazole on the cyclodextrin derivatives namely sulfated-β-cyclodextrin (S-β-CD) and hydroxypropyl-γ-cyclodextrin (HP-γ-CD) as chiral selectors. Molecular docking was performed using AutoDock Vina software...

Photonic jet is a localized sub-wavelength beam generated at the shadow-side surfaces of microscale dielectric cylinders or spheres, when they are illuminated by an electromagnetic wave. We demonstrate the potential of the photonic jets for micro-etching using a nanosecond Near-IR laser (l=1064 nm) that...

In this paper, using hydrogen peroxide solution foaming method, replace part of cement with fly ash foamed concrete and glass fiber preparation, and using the SEM characterization of the glass fiber to foam concrete internal structure, the influence of glass fiber and hydrogen peroxide is discussed on...

This paper discusses in situ measurements of the speech intelligibility of classrooms in a private university in Jakarta. Seven classrooms with and without stepping students seating area are evaluated. Impulse Response method is used to measure the acoustics condition of the classrooms. Their speech...

To observe the proliferation and adhesion of umbilical cord endothelial cells (HUVEC) on the titanium (Ti) surface with large particles blasted-etched (SLA) treatments and further clarify the mechanism of action of each other between the Ti implant surface and the body. Methods: The human umbilical cord...

Quantitative determination of ketorolac, a nonsteroidal anti-inflammatory drug (NSAID) in water samples was reported using the micellar electrokinetic chromatography (MEKC) method. The on-line preconcentration technique at MEKC was then investigated to increase the detection sensitivity of ketorolac....

Nanocrystalline cellulose has been successfully studied by conventional scanning electron microscopy (SEM, JSM-6510LA). Nanocrystalline cellulose was extracted from the natural fibers by the chemical treatments of alkalization and bleaching followed by acid hydrolysis. Alkalization and bleaching resulted...

The pyramid construction was formed with different K3PO4 concentrations under different time and temperatures. The pyramid size, density and uniformity on monocrystalline silicon surface have been studied. We found that the K3PO4 concentrations and temperature has a crucial influence on pyramid density;...

Surabaya has alluvial domination that causes high rise of implication. This research is to know the natural frequency of building and ground, the damping ratio and earth quake micro-zoning. We use FSR (Floor Spectral Ratio) and RDM (Random Decrement Method) method for building analysis, and HVSR (Horizontal...

On the basis summary of forecasting methods and theoretical depth of stope floor, combining a large number of actual data analysis, it is induced that the following six aspects are the main factors influencing the floor damage depth the: mining depth, dip angle of coal seam, mining thickness and length...

In this research, a layered composite that utilizes a perforated plate was developed as a bullet-resistant material that works by breaking the tip of the projectile at the beginning of penetration and reducing the weight of the material. A Composite configuration with 3 layers with a steel plate was...

We characterized the four main chain liquid crystal elastomers (MCLCEs) samples using the x-ray diffraction method. The four samples had different concentration of crosslinkers, i.e 8%, 12%, 14% and 16%. There was a relationship between crosslinkers concentration and d-spacing parameter here, namely...

A rainbow vertex antimagic coloring namely rainbow vertex coloring and antimagic labeling. For a bijective function f E ( G ) → ...

Chitosan in acid was polycationic and can react with negative charges like tripolyphosphate. Tripolyphosphate was a crosslinking agent with low toxicity. This study was to review the ability of crosslinked chitosan-tripolyphosphate (Cs–TPP) in reducing the color levels of methyl orange. Synthesizing...

Nanomaterials are a new option to successfully treat the multiresistant microorganisms. The as-prepared bismuth oxide with the optimal concentration exhibits stronger antibacterial abilities than others. Meanwhile, it exhibits well biocompatibility. In one word, the present approach can shed new light...

Lake Toba is the largest volcanic lake in Southeast Asia that has a multi-sectoral role, both for the benefit of local communities and for national and even international interests. Lake Toba as a tourist destination where in 2020 the Toba Regency Central Statistics Agency recorded the number of passenger...

We report the calculation of the Density of States (DOS) in Twisted Bilayer Graphene (TBG) system for low energy range near Fermi level using commensurate rotation of 1.160, 1.790 and 3.480. We obtain a logarithmic behaviour of DOS showing that van Hove Singularities (VHS) are occurred in this system...

Permanent mold cast (PMC) AJ62 magnesium alloy exhibits a fine-grained microstructure in the thin section and a coarse-grained microstructure in the thick section. Microstructure of the PMC AJ 62 alloy was analyzed by using the Scanning Electron Microscopy (SEM). Potentiodynamic polarization experiments...

The reaction between H2S and ZnO fine particles (T302 desulfurizer) was studied. The experiment results show that at the temperature below 573K, the reaction has stopped before the complete conversion of ZnO particle is obtained. In order to explain the phenomenon, the modified shrinking core model is...

Modification of chitosan by p-t-butylcalix[4]arenes has been conducted using a nucleophilic subtitution reaction between chitosan, p-t-butylcalix[4]arenes and N,N-diisopropyl carbodiimide (DIC) in reagent dichlorometane at room temperature and under nitrogen atmosphere. Analysis structure of the chitosan-p-t-butylcalix[4]arenes...

Emission of terahertz (THz) radiation as a result of optical rectification of intense femtosecond laser pulses on chiral metamaterials has been observed. The chiral metamamaterials has simplified fabrication design but still capable to exhibit different refractive index for each circular polarization....

Hyperbilirubinemia is a common problem in neonatal for contact with the healthcare facilities. Several methods have been used to determine the bilirubin concentration. However, it is not easy to find the healthcare with the instrument to detect bilirubin, mainly in rural area. This research was aimed...

The utilization of water resources for various necessities keeps increasing from year to year, as the impact of the growth of population and the development of the activity. Dams have great benefits and keep great potential danger and risk of physical damage and failure function. This study aims to determine...

With the continuous development of science and technology, the high hardness materials are finding wider and wider application in all fields. But the high hardness make it hard to cut them, which has been a bottleneck to their further application. In this paper, about three hundreds papers on hardness...

One can reasonably say that we always prove geometric theorems using deductive method. The deductive method is too often used such that we get the impression that there is no other alternative appropriate method. In this paper we will use inductive method. We need many special cases to prove so that...

The morning and evening twilight brightness are important to probe the properties of the upper atmosphere. We conducted a short survey of broad band twilight sky brightness measurements by using a portable photometer with 5 second resolution, in five places with different elevations. The darkest zenith...

On the basis of accelerated test of food shelf life theory, the changes of acid & peroxide value of military instant rice packaged by PET/AL/PA/PE coextruded film at different storage temperature were studied. The kinetics models of shelf life were obtained at corresponding temperature so as to predict...

The research discussed the graphically analyzed of the cumulative distribution function (cdf), and the power function of hypothesis testing on the binomial distribution. In this research, we also showed (derived) the formula of the power function on special case of binomial such us Negative Binomial...

Two chiral poly(3,4-ethylenedioxythiophene) (PEDOT) derivatives, poly(N-(tert-butoxycarbonyl)-Lphenylalayl (3,4-ethylenedioxythiophene-2'-yl)methylamide) (PEDOT-Boc-Leu) and poly(L-phenylalayl (3,4- ethylenedioxythiophene-2'-yl)methylamide) (PEDOT-Leu) modified electrodes were used to recognize 3,4-...

Exoplanetary system HD 4732 harbors two planets (b and c) in elliptic orbits. The host star (HD 4732) is more energetic than the Sun, while the planets are Jupiter-class. In this work we deal with the triangular equilibrium points with respect to planet HD 4732c because, interestingly, its orbit is located...

This study investigates the influence of Cobalt in magnetorheological elastomer (Co-MRE) on which the magnetic effect could be applied in soft optical electronics such as wearable and flexible sensors. Polydimethylsiloxane (PDMS) was used as a medium, and Co was used as a filler to construct isotropic...

All graphs considered in this paper are simple, finite and connected graph. Let G(V, E) be a graph with the vertex set V and the edge set E, and let w be the edge weight of graph G. with | V ( G ...

The measurement of internal residual strain on the elastic, yield and plastic pre-strained of SS400 during welding had been performed using neutron diffraction technique. SS400 steel has been welded using gas metal arc welding (GMAW) in pre-strained condition of 0%, 1%, 3%, and 5%. This paper will present...

The research studied disease mapping of dengue haemorrhagic fever (DHF) in Banyumas Regency. The generalized Poisson (GP), negative binomial (NB), and CAR-BYM models are then used to modelling the DHF. The predictor variables used in this research are the number of health worker, altitude, and population...

The variable regular for sliding wear under load, sliding velocity, temperature and surface roughness and fatigue damage under load, sliding velocity and surface roughness by mass experimental datum were established. The analytic model for sliding wear-fatigue damage interaction was established. The...

New Europium(III) complexes were designed and synthesized as new white light emitting molecules. Eu(III) complexes comprised a blue light emitting Courmarin 6G fluorophore and a EuIII moiety as the origin of red light and thus exhibited red, blue or white light in different excitation wavelength and...

Among comets there are several groups of Sun-grazers. Sun-grazing comets are comets whose motions encounter very closely to the Sun and may eventually plunge into the Sun. Sun-grazing comet C/2011 W3 (Lovejoy) was not expected to survive during close encounter with the Sun on December 16, 2011 due to...

Absorption bandwidth of conventional Micro-Perforated Panel backed by air cavity is limited around 1 octave bands particularly for pore diameter close to 1 mm. Compared with porous material, the absorption bandwidth is relatively narrow. Hence, its applications may become limited. This research shows...

In the applications of solar cells, reflection is an unwanted loss process. Using antireflective solar glass can improve the generating efficiency of solar cells. Here the design, synthesis, modification, and characterization of the nano antireflective film for solar modules are reported. Nanometer SiO2...

In this research, we estimate the coefficient in the class of Bazilevic functions ℬ1(α) related to the Lemniscate Bernoulli on the unit disk 𝔻={z:|z| < 1}, satisfying subordination condition [f′(z)(f(z)z)α−1]≺1+z, for z ∈ 𝔻. The upper bound of the modulus of a2 and a3 are determined.

WMO states that temperature is an important parameter in life and defines temperature as a physical quantity that characterizes the average random motion of molecules in a physical body. The accuracy of temperature measurement on a thermometer is influenced by the selection of the right and accurate...

Coadsorption of oxygen (O) and carbon monoxide (CO) on Platinum-alloy (Pt-alloy) surfaces is investigated by using density functional theory (DFT). Simultaneous coadsorption and alloying are considered in order to get more realistic picture of the electrode condition, i.e., in relation with surface CO...

Fe-Al alloys with different Al contents were prepared with commercially pure Fe and Al in a vacuum induction furnace. The hardness of the Fe-Al alloys with different Al content and heat treatments was measured using a Vickers-hardness tester of HVS-5, applying a load of 9.8 N and keeping for 8 s. In...

This study investigated the properties of mesocarbon anodes in the half-cell of sodium-ion batteries. The behavior of mesocarbon was examined using electrochemical methods. Cyclic voltammetry (CV) was applied with various scan rates to reveal the anodic-cathodic voltage and peak current. The CV profile...

In this paper we determine a slightly detailed the solution formula of the incompressible fluid flows by using Fourier transform in N-dimensional Euclidean space (N≥ 2) for the linearized equations. For further research, from this result we can estimate the boundedness of the operator families. This...

In the applications of solar cells, reflection is an unwanted loss process. Using antireflective solar glass can improve the generating efficiency of solar cells. Here the design, synthesis, modification, and characterization of the nano antireflective film for solar modules are reported. Nanometer SiO2...

The effect of magnetic field on the nematic-isotropic phase transition of liquid crystal was studied by Monte Carlo simulation. The classical spin lattice model was used to describe the liquid crystal systems and the Lebwohl-Lasher potential model. We calculate the energy per spin, the orientational...

The crystallographic properties and ferroelectric state of BZT multilayer films which deposited on Si (100) substrate was studied in this work. XRD pattern peaks show that BaZr0.1T0.9O3 and BaZr0.08Ti0.92O3 are found well-crystallized at 800oC for 3 hours corresponding to vary annealed temperature. The...

For any graph G = ( V , E ) , the order and size of G are p and q. Let G(V, E) be a graph with the vertex set V and the edge set...

Alpha-fetoprotein (AFP) is an oncofetal protein during Hepatocellular carcinoma (HCC) development which could generate weaker and less reproducible antitumor protection, and may serve as a target for immunotherapy. Therefore, it is imperative to enhance its immunogenicity and develop therapeutic vaccines...

The thermal stability of carbon fiber in PIPprocessed C/SiC composites under high temperature environment was studied. The microstructure evolution of carbon fiber in PIP-C/SiC composites was characterized. The results showed that the microstructure of carbon fiber gradually destroyed with the elevation...

Wastewater stabilization pond is a very large pond where wastewater is stored for a long time, in that pond there is a biological process of organic matter in the sludge produced from primary deposition, and it’s resulting in stable biological treatment of wastewater. Wastewater treatment is used to...

Silat village is a village upstream of the Kapuas River, which is the longest river in Indonesia. One of the tributaries of the Kapuas River is the Silat River. The history of population distribution on the island of Kalimantan, especially West Kalimantan is through water transportation, this condition...

This paper reports a field investigation of the metal contact phenomenon in gas pipelines buried underneath urban areas by utilizing the combination of current attenuation survey (CAS) and ground penetrating radar (GPR) methods. CAS examined pipeline integrity based on standard NACE SP0502 and utilized...

The determination method for the content of trace element of Cu, Fe, Mn, Zn and Ni in tea by the wet digestionflame atomic absorption spectrometry (FAAS) was established. The effect of digestive reagents, the volume of digestion and the digestion time were investigated in detail. The optimum condition...

This research project is based on vocational skills in physics teaching materials for vocational high school students. Vocational skill-based project was developed to improve the skills of vocational students. The series of student activities, scientific activities and assignments designed so as to help...

The 16Mn steel has good mechanical properties and welding performance, so it is used widely in pressure vessels, petroleum storage tanks and pipelines of oil and gas. Submerged arc welding was employed to weld 16Mn, by OM, the microstructure in every region of welding joint was observed, by means of...

Gas sensor was needed to detect and the presence of gas, either for toxic gas or non toxic gas. The one of the important part in gas sensor instrument are the metal oxide. There are some ways to make metal oxide for sensing material of gas sensor; the one is sol-gel process. The purpose of this experiment...

Currently, the development of the quality of human resources will determine the progress of a nation. The era of the industrial revolution 4.0 requires someone to master several skills, one of which is the ability of students’ mathematical connections. By having mathematical connection skills, students...

To explore and rationalize the enhancement of the capacity of lithium-ion batteries, ab initio density functional theory was employed to investigate the adsorption and diffusion properties of a lithium atom on and through pristine and Stone-Thrower-Wales (STW)-defective silicenes. The theoretical calculations...

A geothermal system is basically a system where heat is transferred from the internal part to the surface of the earth dominantly by conduction, convection, or both. The spatial variation of the magnitude of conductive heat transfer represented by lateral variation of observed surface heat flow values...

Ulcerative colitis is chronic nonspecific colitis. Now,the main first-line drugs are preparations with mesalazine. Chemical name of mesalazine is 5- aminosalicylic acid (5-ASA), which one of colon target drugs has function of anti-inflammatory by inhibit process of leukotriene, prostaglandin E(PG) and...

The application of matrices to cryptographic problems, especially with Hill Chiper algorithm, needs an invertible matrix as a key and a plaintext’s difuser. One of the invertible matrices is a Hadamard matrix (H). The Hadamard matrix is applied to cryptographic problems with Hill Chiper algorithm by...

Previously we built a Max-Plus Algebraic model for the problem of the hierarchical structure of the Semi-Double Track railway line based on the Petri Net model. Then we also perform a delay simulation on the model obtained. Based on this research, we conclude that the Petri Net model does not reflect...

Fabricating porous material can be done using various raw materials, one of them uses plant-based natural fiber to form composite materials. In this research, the natural fibers of sugarcane waste are synthesized into micro cellulose. Subsequently, the micro cellulose is developed as a filler for the...

A kind of rare earth copolymerizd monodisperse poly (methyl methacrylate) microspheres material was synthesized through dispersion polymerization. The chemical structure and chemical properties of the material were characterized by means of canning electronic microscope morphology (SEM), ultraviolet...

A monitoring of human postural balance in bipedal standing is an important parameter in medicine, related to balance disorder. A Human Postural Balance Monitoring System in Bipedal Standing (HPBMSBS) consists of a 3- axis digital position sensor module, a Programmable System-on-Chip (PSoC) 4, and a PC-display....

Ternary lyotropic liquid crystal (LLC), was prepared by mixing tetradecyltrimethylamonium bromide (MTAB), water and azobenzene (Az). The phase transition of the LLC was induced from LC phase to isotropic (I) one upon Ar+ laser, which was owing to the trans-cis-trans phoisomerizaion cycle of Az during...

In this paper we discusses Moore-Penrose inverse in symmetrized max-plus algebraic matrix. The existence of Moore-Penrose inverse is shown using a link among symmetrized max-plus algebra and conventional algebra. The result is a Moore-Penrose inverse in symmetrized max-plus algebraic matrix exists. Furthermore,...

In order to study the influence of Isopropyl Nitrate on combustion characteristics of triple-base propellant, the combustion of triple-base propellant was tested with closed bomb. Combustion characteristic parameters including maximum pressure, combustion time, gas generated brisance, pressure impulse,...

Practical activities can help teachers deliver material because students are directly involved and observing. In addition, practical activities also help students understand concepts. This research aims to make teaching aids to understand the concept of light propagation on fibre optic cables in schools....

Sound absorption performance of cavity backed perforated panel on respect to the influence of flexible perforated membrane insertion was investigated by using a laboratory experiment. A layer of perforated flexible membrane was fitted inside the cavity backed MPP and the sound absorption coefficient...

Let G(V(G), E(G)) be a connected, undirected, and simple graph with vertex set V(G) and edge set E(G). For a bijective function f : V ( G ) ⟶ ...

The importance of the quantum chemical method and thermal decomposition kinetics on double-base propellant was reviewed. The main analysis methods and theory mode of thermal decomposition kinetics were enumerated and analyzed. It is significant to put quantum chemical method and thermal decomposition...

A comparison of second order and high order (4th, 8th and 12th order) of finite difference staggered-grid method on 2D P-SV elastic wave propagation has been conducted. The comparison plot of numerical dispersion and accuracy among each order has been generated to show the stability condition. CUDA C...

Cuprous iodide (CuI) is a p-type semiconductor material with wide band gap, which has attracted considerable attention in recent years because of its unique photoelectric characteristic and potential application in solar cells. This article presents the preparation of Ag doped and undoped CuI films on...

This paper discusses the properties of the Rn module over the matrix ring Mn×n(R) related to the torsion module, prime module, multiplication module, and faithful module. The study results concluded that the Rn module over the matrix ring Mn×n(R) is a torsion module because each element of Rn is a torsion...

Sensitivity issue becomes a common problem on Electrical Impedance Tomography. One effort to overcome this issue is through inducing a magnetic field. It needs proper inducer coil configuration in order to produce a good reconstruction result. In this study, inducer coil configuration is obtained to...

This research was conducted in the Seropan underground river in the Gunung Sewu karst, Gunung Kidul Regency. This study aimed to identify some of the flood hydrograph properties of the Seropan underground river to characterize the karst aquifer. A water level data logger is installed to detect underground...

In this report, a kind of fatty acid esters of isethionate was synthesized with myristic acid and sodium hydroxyethyl sulfonate as raw materials and methane sulfonic acid as catalyst. Then, the effects of molar ratio of reactants, reaction temperature, catalyst dosage and reaction time on the product...

Interpretation of the subsurface rock layer structure model has been carried out using geomagnetic data in the Palu Valley. Geomagnetic data is obtained through field measurements using the Proton Precision Magnetometer. Modeling is done using total magnetic field intensity data. The research objective...

Frequency dependent attenuation of seismic waves that propagate through the partially fluid saturated porous rock will be observed. The new method for estimation of frequency dependent attenuation will be developed. The frequency dependent attenuation will be calculated in time-frequency domain which...

Shrink packaging is a packaging way which is widely used in the field of modern goods packaging. Its packaging forms, the development of new technology and application field ware summarized. Its outstanding features, such as transparent and intuitive, efficient, seal and moistureproof, flexible and convenient...

The complex conjugate approach could be used easily to solve derivatives analytically for some simple cases in calculus. These cases are common topics in calculus which are functions of trigonometry, hyperbole, exponential and logarithm. In general, the derivative obtained from the component v is rearranged...

A new photochchromic diarylethene was synthesized and explored, which is named 1-[2-methyl-5-(2- pyridyl)-3thienyl]-2-[2-methyl-5- 4-bromomethylphenyl -3- thienyl]perfluorocyclopentene. The results showed that it have excellent photochromism, accompanied with the color change from colorless to blue,...

An unsymmetrical photochromic diarylethene, 1-[2- methyl-5-(4-n-amyl-phenyl)-3-thienyl]-2-[2-methyl-1-phenyl] perfluorocyclopentene (1o), has been synthesized. Its photochromic properties were examined. The results showed that this compound exhibited reversible photochromism and undergo reversible cyclization...

Instrumentation system for testing of conductive concrete material using four-electrode method has been built. The system can measure material resistivity under the influence of voltage-injection variable, temperature changing in the characterization reactor, as well as the duration of the material characterization....

This study aims to develop rainbow antimagic coloring. A graph G is said to be a rainbow antimagic coloring if there is a bijection function f : V ( G ) → ...